[axomhacker]

Don't know if you are trolling. But if this is genuine: this is rbenv telling you that you have multiple rubies installed.

1. Pick one (just for this session): $ rbenv shell ruby1.9.1

2. And then run the example.

By the way 1.9.1 is really old already, 1.9.3 has a lot more bug fixes.

[alrs]

ruby1.9.1 on Debian isn't ruby 1.9.1.

The Ruby language changed between 1.9 and 1.9.1, so a new package name had to be created.

If 1.9.1 was just called "1.9" it would break all of the packages in Debian that depend on whatever language features were different between 1.9 and 1.9.1.

"ruby1.9.1" in Debian 7.0 provides version 1.9.3.194.

[axomhacker]

The OP's output looked more like rbenv's output though, right? How did you figure that to be debian's message?